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MAX1857EUA47+T from MAXIM,MAXIM - Dallas Semiconductor

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MAX1857EUA47+T

Manufacturer: MAXIM, MAX

500mA, Low-Dropout, Ripple-Rejecting LDO in µMAX

Partnumber Manufacturer Quantity Availability
MAX1857EUA47+T MAXIM, MAX 5000 In Stock

Description and Introduction

500mA, Low-Dropout, Ripple-Rejecting LDO in µMAX The MAX1857EUA47+T is a step-down DC-DC converter manufactured by Maxim Integrated (now part of Analog Devices). Below are its key specifications, descriptions, and features:

### **Specifications:**  
- **Input Voltage Range:** 4.5V to 28V  
- **Output Voltage:** Adjustable from 0.8V to 5.5V (factory preset to 4.7V for the MAX1857EUA47+T variant)  
- **Output Current:** Up to 2A  
- **Switching Frequency:** 500kHz  
- **Efficiency:** Up to 95%  
- **Operating Temperature Range:** -40°C to +85°C  
- **Package:** 8-pin μMAX (MSOP)  

### **Descriptions:**  
- A synchronous buck (step-down) DC-DC converter with integrated power MOSFETs.  
- Designed for high-efficiency power conversion in applications such as telecom, networking, and industrial systems.  
- Features pulse-width modulation (PWM) control for stable output.  

### **Features:**  
- **Integrated Power MOSFETs** – Reduces external component count.  
- **Adjustable/Fixed Output Voltage** – Factory preset to 4.7V (MAX1857EUA47+T).  
- **High Efficiency** – Up to 95% with synchronous rectification.  
- **Low Dropout Operation** – Extends battery life in portable applications.  
- **Overcurrent and Thermal Protection** – Enhances reliability.  
- **Soft-Start Function** – Prevents inrush current at startup.  

For detailed application notes, refer to the official datasheet from Maxim Integrated/Analog Devices.

Application Scenarios & Design Considerations

500mA, Low-Dropout, Ripple-Rejecting LDO in µMAX

Alternative Part Number

  • TPS73647DCQ --: Low-dropout linear regulator with 4.7V fixed output in a small package, functionally similar to the MAX1857 and widely available.
  • LP2985AIM5-4.7 --: 4.7V fixed-output LDO regulator in SOT-23-5, comparable current capability and pin-compatible footprint for many designs.
  • MIC5205-4.7YM5 --: 4.7V fixed LDO in SOT-23-5 with low dropout and low quiescent current, suitable as a drop-in style replacement.

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